I agree with Brock, you can't properly place a facet joint without flouro, and epidurals do not require it, but it is advantageous. I would add that transforaminal injections and true SI joint injections also require flouro. Again it is advantageous but not required for other nerve blocks, such as interscalene, peripheral, femoral, and so on, as well as other joint injections such as shoulder, hip and knee.
Hope this helps.